/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package io.openmessaging.benchmark.driver.natsStreaming;

import io.nats.streaming.AckHandler;
import io.nats.streaming.StreamingConnection;
import io.openmessaging.benchmark.driver.BenchmarkProducer;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;

public class NatsStreamingBenchmarkProducer implements BenchmarkProducer {
    private StreamingConnection natsStreamingPublisher;
    private String topic;
    public NatsStreamingBenchmarkProducer (StreamingConnection natsStreamingPublisher, String topic) {
        this.natsStreamingPublisher = natsStreamingPublisher;
        this.topic = topic;
    }

    @Override public CompletableFuture<Void> sendAsync(Optional<String> key, byte[] payload) {
        CompletableFuture<Void> future = new CompletableFuture<>();
        final String[] guid = new String[1];
        AckHandler acb = new AckHandler() {
            @Override public void onAck(String s, Exception e) {
               if ((e != null) || !guid[0].equals(s)) {
                   future.completeExceptionally(e);
               } else {
                   future.complete(null);
               }
            }
        };
        try {
            guid[0] = natsStreamingPublisher.publish(topic, payload, acb);
        } catch (Exception e) {
            future.completeExceptionally(e);
        }
        if (guid[0].isEmpty()) {
            future.completeExceptionally(new Exception("Expected non-empty guid to be returned."));
        }
        return future;
    }

    @Override public void close() throws Exception {

    }
}
